CN115521057A - Optical fiber preform and method for manufacturing the same - Google Patents
Optical fiber preform and method for manufacturing the same Download PDFInfo
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- CN115521057A CN115521057A CN202211161281.XA CN202211161281A CN115521057A CN 115521057 A CN115521057 A CN 115521057A CN 202211161281 A CN202211161281 A CN 202211161281A CN 115521057 A CN115521057 A CN 115521057A
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- sleeve
- optical fiber
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
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Abstract
The present application provides an optical fiber preform and a method for manufacturing the same, including: providing a prefabricated optical fiber preform with a first target size, and connecting a first preform connecting rod to a first end of the prefabricated optical fiber preform; providing a pre-processing sleeve with a second target size, and connecting a first sleeve connecting pipe to a first end of the pre-processing sleeve; respectively fixing the first preform connecting rod and the first sleeve connecting pipe, so that the prefabricated optical fiber preform is sleeved into the cavity of the prefabricated sleeve along the axial direction from one end of the prefabricated sleeve, which is far away from the first sleeve connecting pipe; and enabling the cavity of the preprocessing sleeve to be in a negative pressure state, heating the preprocessing sleeve, and fusing the preprocessing sleeve and the outer cladding of the preprocessing optical fiber preform to form a target optical fiber preform. That is, the optical fiber preform manufactured by the manufacturing method of the present application can ensure concentricity of the core and the outer cladding.
Description
Technical Field
The application belongs to the technical field of optical fiber manufacturing, and particularly relates to an optical fiber preform and a manufacturing method thereof.
Background
The special optical fiber used in the fiber laser has extremely strict requirements on the core cladding ratio (core diameter/outer cladding diameter) of the optical fiber preform. In order to obtain a high-precision core cladding ratio, an initial optical fiber preform with a large fiber core diameter is usually stretched, a preprocessed optical fiber preform is obtained after the initial optical fiber preform is stretched to a target size, then, sleeve processing of an outer cladding is carried out on the preprocessed optical fiber preform, the outer cladding of the outer sleeve and the outer cladding of the preprocessed optical fiber preform are fused in a seamless mode, and the optical fiber preform with the target core cladding ratio is obtained.
The mode of the sleeve generally comprises a horizontal sleeve and a vertical sleeve, and the concentricity between the optical fiber perform and the outer sleeve cannot be ensured in the horizontal sleeve mode at present, so that the fiber core in the optical fiber perform deviates from the central position, and the contact ratio between the fiber cores of the two optical fibers is difficult to ensure during the fusion splicing between subsequent optical fibers.
Disclosure of Invention
The present application is directed to an optical fiber preform and a method for manufacturing the same, which solve the above-mentioned problems of the prior art.
The technical scheme adopted by the application is as follows: a method of fabricating an optical fiber preform, comprising:
providing a prefabricated optical fiber preform with a first target size, and connecting a first preform connecting rod to a first end of the prefabricated optical fiber preform;
providing a pre-processed casing of a second target size, and connecting a first casing connecting pipe to a first end of the pre-processed casing;
respectively fixing the first preform connecting rod and the first sleeve connecting pipe, enabling the prefabricated optical fiber rod to be coaxial with the prefabricated sleeve, and enabling one end, far away from the first sleeve connecting pipe, of the prefabricated optical fiber rod to be sleeved into a cavity of the prefabricated sleeve along the axial direction under the driving of the first preform connecting rod and/or the first sleeve connecting pipe; and
and heating the preprocessing sleeve pipe under the negative pressure state in the cavity of the preprocessing sleeve pipe, so that the preprocessing sleeve pipe and the outer cladding of the preprocessing optical fiber preform are fused to form a target optical fiber preform.
That is to say, this application can be respectively through the first prefabricated excellent connective bar that connects to the prefabricated optical fiber perform of first target size to and fix to the first sleeve connecting pipe that the sleeve pipe of preprocessing of second target size connects, make prefabricated optical fiber perform and prefabricated sleeve pipe can be coaxial, and through the drive of first prefabricated excellent connective bar and/or first sleeve connecting pipe fixed, make prefabricated optical fiber perform can keep away from the one end of first sleeve connecting pipe along the axis direction embolia the intracavity of prefabricated sleeve pipe from prefabricated optical fiber perform of preprocessing, guarantee to embolia prefabricated optical fiber perform and prefabricated sleeve pipe coaxial of preprocessing in the prefabricated sleeve pipe intracavity, and then fuse at prefabricated sleeve pipe and prefabricated optical fiber perform's of preprocessing surrounding layer and form target optical fiber perform, make the core ratio of target optical fiber perform reach the requirement of precision, and can guarantee the concentricity of the fibre core of target optical fiber perform and surrounding layer.
Further, the fixing the first preform connecting rod and the first sleeve connecting pipe respectively, making the prefabricated optical fiber preform coaxial with the prefabricated sleeve, and making one end of the prefabricated optical fiber preform far away from the first sleeve connecting pipe from the prefabricated sleeve be sleeved into the cavity of the prefabricated sleeve along the axial direction under the driving of the first preform connecting rod and/or the first sleeve connecting pipe comprises:
providing a group of first fixing pieces and second fixing pieces which are coaxial and arranged oppositely; and
the first fixing piece is used for fixing the first prefabricated rod connecting rod, the second fixing piece is used for fixing the first sleeve connecting pipe, and under the action of the first fixing piece and/or the second fixing piece, one end, far away from the first sleeve connecting pipe, of the prefabricated optical fiber prefabricated rod is sleeved into the cavity of the prefabricated sleeve.
Further, before providing a second target size of prefabricated casing and connecting a first casing connecting pipe to a first end of the prefabricated casing, the method further comprises:
providing an initial casing with an initial size, and respectively connecting the first casing connecting pipe and the second casing connecting pipe to the two opposite ends of the initial casing;
fixing the first casing connecting pipe and the second casing connecting pipe, and heating the initial casing to collapse the initial casing to a preprocessed casing of the second target size; and
removing a second casing connection tube in the second target size of pre-manufactured casing.
Further, the fixing the first sleeve connecting pipe and the second sleeve connecting pipe further includes:
and etching the inner wall of the initial sleeve to remove impurities on the inner wall of the initial sleeve.
Further, the etching the inner wall of the initial casing to remove impurities from the inner wall of the initial casing includes:
introducing a first gas into the cavity of the initial sleeve through the first sleeve connecting pipe or the second sleeve connecting pipe, and heating the initial sleeve at the same time, so that the first gas etches the inner wall of the initial sleeve; or alternatively
And introducing mixed gas of first gas and second gas into the cavity of the initial sleeve through the first sleeve connecting pipe or the second sleeve connecting pipe, and heating the initial sleeve to enable the first gas to etch the inner wall of the initial sleeve.
Further, the first gas is SF 6 The second gas is O 2 。
Further, the etching the inner wall of the initial casing to remove the impurities from the inner wall of the initial casing, and then further comprising:
and heating the etched initial sleeve at 1800-2000 ℃ to remove the impurities remained on the inner wall of the initial sleeve by etching.
Further, the etching the inner wall of the initial casing to remove the impurities from the inner wall of the initial casing may further include:
cleaning the initial casing;
introducing a third gas into the cavity of the initial sleeve through the first sleeve connecting pipe or the second sleeve connecting pipe, and heating the initial sleeve to remove water and preheat the initial sleeve; or alternatively
And introducing mixed gas of second gas and third gas into the cavity of the initial sleeve through the first sleeve connecting pipe or the second sleeve connecting pipe, and heating the initial sleeve to remove water and preheat the initial sleeve.
Further, the removing of the second casing connection tube in the second target size of pre-manufactured casing comprises:
sealing the second casing connecting tube;
keeping a preset pressure value in the cavity of the pre-processing sleeve; and
and heating the joint of the second sleeve connecting pipe and the pre-processing sleeve, and driving the second sleeve connecting pipe to move relative to the pre-processing sleeve so as to separate the second sleeve connecting pipe from the pre-processing sleeve.
Further, the step of enabling the cavity of the pre-processing sleeve to be in a negative pressure state and heating the pre-processing sleeve to fuse the pre-processing sleeve and the outer cladding of the pre-processing optical fiber preform to form a target optical fiber preform further comprises the following steps:
enabling the cavity of the preprocessing sleeve to be in a negative pressure state;
rotating the prefabricated optical fiber preform and the prefabricated sleeve around their central axes respectively; and
gradually heating from one end of the prefabricated sleeve to the other end of the prefabricated sleeve along the axial direction.
Further, the method also comprises the following steps:
removing the first preform connecting rod and the first sleeve connecting pipe connected with the target optical fiber preform; and
and connecting handles at two ends of the target optical fiber preform.
An optical fiber preform manufactured by the method of manufacturing an optical fiber preform according to any one of the above aspects, the optical fiber preform comprising a core and an outer cladding, the outer cladding covering an outer surface of the core.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a block flow diagram of a method for fabricating an optical fiber preform according to an embodiment of the present disclosure;
FIG. 2 is a block flow diagram of step S600 of a method for fabricating an optical fiber preform according to the embodiment of FIG. 1;
FIG. 3 is a second block diagram of a process flow for manufacturing an optical fiber preform according to the embodiment of FIG. 1;
FIG. 4 is a block flow diagram of step S500 of a method for fabricating an optical fiber preform according to the embodiment of FIG. 1;
FIG. 5 is a block flow diagram of step S700 of a method for fabricating an optical fiber preform according to the embodiment of FIG. 1;
FIG. 6 is a third block diagram of a process for fabricating an optical fiber preform according to the embodiment of FIG. 1;
FIG. 7 is a schematic view illustrating a method for fabricating a target optical fiber preform according to the method for fabricating an optical fiber preform provided in the embodiment of FIG. 1;
fig. 8 is a schematic diagram illustrating a prefabricated sleeve manufactured by the method for manufacturing an optical fiber preform according to the embodiment of fig. 1.
Reference numerals:
10. preprocessing an optical fiber preform; 20. pre-processing a sleeve; 30. a first preform connecting rod; 40. a first sleeve connecting pipe; 50. a first fixing member; 60. a second fixing member; 70. an oxyhydrogen flame burner; 80. an air pipe; 90. initial sleeving; 100. a second sleeve connecting tube.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The present application provides a method for fabricating an optical fiber preform of a target core-to-cladding ratio (core diameter/outer cladding diameter). In general, a tube is sleeved on an optical fiber preform with an initial core-cladding ratio to form an optical fiber preform with a target core-cladding ratio.
Specifically, one or more layers of sleeves are further wrapped on the outer surface of the optical fiber preform with the initial core-cladding ratio (namely the outer cladding of the optical fiber preform), and the outer surfaces of the sleeves and the optical fiber preform with the initial core-cladding ratio are fused to form a new outer cladding of the optical fiber preform, so that the optical fiber preform with the target core-cladding ratio is obtained.
Referring to fig. 1 and 7, the optical fiber preform manufacturing method includes the steps of:
step S100, providing a prefabricated optical fiber rod with a first target size, and connecting a first prefabricated rod to the first end of the prefabricated optical fiber rod.
Wherein the first target size may be a core-cladding ratio of the prefabricated optical fiber preform before the jacketing.
The preform may be a first target size preform formed after processing through a primary size preform.
It can be understood that the core cladding ratio of the target optical fiber preform generally needs to be determined according to an actual application scenario and an application environment, and the core cladding ratio of the target optical fiber preform is different due to different application scenarios and application environments, so that the first target size (i.e., the core cladding ratio) of the prefabricated optical fiber preform for the sleeve may also be different. Therefore, in practical applications, a preform of a first target size may be obtained by processing a starting optical fiber preform of a first starting size into a preform of a first target size. Wherein the primary optical fiber preform of the primary size may be an optical fiber preform having a larger core diameter.
For example, a first target size of a prefabricated optical fiber preform to be clad with a jacket tube can be calculated according to the initial size of the initial optical fiber preform (i.e., initial core ratio), the target size of the target optical fiber preform (i.e., target core ratio), and the specification of the jacket tube to be clad (i.e., inner and outer diameter dimensions of the jacket tube, wall thickness of the jacket tube, etc.), and then the prefabricated optical fiber preform of the first target size can be formed by stretching the initial optical fiber preform of the initial size. The above calculation process is conventional physical calculation, and is not described in detail herein.
And step S500, providing a prefabricated sleeve with a second target size, and connecting a first sleeve connecting pipe to the first end of the prefabricated sleeve.
Wherein the second target size may be a gauge size of the prepared casing prior to casing (the gauge size may include an inner and outer diameter of the casing, a wall thickness of the casing, etc.).
The pre-finished casing may be a casing of a second target size formed by machining an initial casing of an initial size.
It can be understood that the core cladding ratio of the target optical fiber preform generally needs to be determined according to the actual application scenario and the application environment, and different application scenarios and application environments cause the core cladding ratio of the target optical fiber preform to be different, so that the second target size of the pre-processing sleeve for covering the pre-processing optical fiber preform may also be different.
Thus, in practice, a pre-manufactured sleeve of a second target size may be manufactured by machining an initial sleeve of one initial size. Wherein the initial size of the initial casing may be a larger gauge casing.
And S600, respectively fixing the first preform connecting rod and the first sleeve connecting pipe to enable the prefabricated optical fiber preform rod and the prefabricated sleeve to be coaxial, and enabling one end, far away from the first sleeve connecting pipe, of the prefabricated optical fiber preform rod to be sleeved into a cavity of the prefabricated sleeve along the axis direction under the driving of the first preform connecting rod and/or the first sleeve connecting pipe.
For example, referring to fig. 7, in the horizontal sleeving manner, the first preform connecting rod 30 and the first sleeving connecting pipe 40 are respectively fixed, so that the prefabricated optical fiber preform 10 and the prefabricated sleeving 20 are respectively placed in a horizontal, coaxial and opposite manner, and then the prefabricated optical fiber preform 10 is driven by the first preform connecting rod 30 and/or the first sleeving connecting pipe 40 to be sleeved into the cavity of the prefabricated sleeving 20 along the axial direction from one end of the prefabricated sleeving 20 far from the first sleeving connecting pipe 40, which can ensure that the prefabricated optical fiber preform 10 sleeved into the cavity of the prefabricated sleeving 20 is coaxial with the prefabricated sleeving 20.
Wherein, under the driving of the first preform connecting rod 30 and/or the first sleeve connecting pipe 40, the prefabricated optical fiber preform 10 is sleeved into the cavity of the prefabricated sleeve 20 along the axial direction from one end of the prefabricated sleeve 20 far away from the first sleeve connecting pipe 40, and the specific mode may be:
the prefabricated optical fiber preform 10 is inserted into the prefabricated sleeve 20 in an axial direction by being driven by the first preform connecting rod 30 and/or the first sleeve connecting tube 40 under the action of the fixing member for fixing the first preform connecting rod 30 and/or the first sleeve connecting tube 40.
It should be noted that, the prefabricated optical fiber rod 10 is sleeved into the prefabricated sleeve 20 in the axial direction, which may be as follows:
moving the prefabricated optical fiber rod 10 under the action of the connecting rod 30 of the first prefabricated rod, and then sleeving the prefabricated optical fiber rod 10 into the prefabricated sleeve 20; or
Moving the prefabricated casing 20 under the action of the first casing connecting pipe 40, so that the prefabricated optical fiber preform 10 is sleeved in the prefabricated casing 20; or alternatively
The prefabricated optical fiber preform 10 and the prefabricated sleeve 20 are simultaneously moved by the simultaneous operation of the first preform connecting rod 30 and the first sleeve connecting tube 40, and the prefabricated optical fiber preform 10 is nested in the prefabricated sleeve 20.
And S700, enabling the cavity of the pre-processing sleeve 20 to be in a negative pressure state, heating the pre-processing sleeve 20, and fusing the outer cladding of the pre-processing sleeve 20 and the pre-processing optical fiber perform 10 to form a target optical fiber perform.
Wherein, the negative pressure state can be that the cavity of the pre-processing sleeve 20 is in a pressure state of-900 mbar to-400 mbar. For example, the cavity of the pre-machined sleeve 20 may be at a pressure of-900 mbar or at a pressure of-600 mbar or at a pressure of-400 mbar.
For example, the first sleeve connecting pipe 40 can be connected with the air pipe 80 to vacuumize the interior of the preprocessing sleeve 20, so that the cavity of the preprocessing sleeve 20 is in a pressure state of-900 mbar to-400 mbar.
The target optical fiber preform is an optical fiber preform having a target core-cladding ratio.
The heating temperature may be 1800 ℃ to 2500 ℃. For example, the heating temperature is 1800 ℃, 2100 ℃, or 2500 ℃.
That is to say, the application can respectively fix the first preform connecting rod 30 connected to the prefabricated optical fiber preform 10 of the first target size and the first sleeve connecting pipe 40 connected to the prefabricated sleeve 20 of the second target size, so that the prefabricated optical fiber preform 10 and the prefabricated sleeve 20 can be coaxial, and the prefabricated optical fiber preform 10 can be sleeved into the cavity of the prefabricated sleeve 20 along the axial direction from one end of the prefabricated sleeve 20 far away from the first sleeve connecting pipe 40 under the driving of the fixed first preform connecting rod 30 and/or the fixed first sleeve connecting pipe 40, so that the prefabricated optical fiber preform 10 sleeved into the cavity of the prefabricated sleeve 20 is coaxial with the prefabricated sleeve 20, and then the prefabricated sleeve 20 and the outer cladding of the prefabricated optical fiber preform 10 are fused to form the target optical fiber preform, so that the core ratio of the target optical fiber preform meets the requirement of precision, and the concentricity of the core and the outer cladding of the target optical fiber preform can be ensured.
With reference to fig. 2 and 7, in step S600, the first preform connecting rod and the first sleeve connecting pipe are respectively fixed, so that the pre-processed optical fiber preform is coaxial with the pre-processed sleeve, and under the driving of the first preform connecting rod and/or the first sleeve connecting pipe, one end of the pre-processed optical fiber preform, which is far away from the first sleeve connecting pipe from the pre-processed sleeve, is sleeved in the cavity of the pre-processed sleeve along the axis direction, which may specifically include:
step S610, a set of first fixing element and second fixing element are provided, wherein the first fixing element and the second fixing element are coaxially and oppositely disposed.
Here, referring to fig. 7, the first and second fixing members 50 and 60 may be chucks, jaws, or the like, and the first and second fixing members 50 and 60 may rotate on their axes and may be movable in the axial direction.
And S620, fixing the connecting rod of the first prefabricated rod by the first fixing piece, fixing the connecting pipe of the first sleeve by the second fixing piece, and sleeving one end, far away from the connecting pipe of the first sleeve, of the prefabricated optical fiber prefabricated rod into the cavity of the prefabricated sleeve under the action of the first fixing piece and/or the second fixing piece.
It can be understood that the first holder 50 and the second holder 60 are coaxially opposite to each other as shown in fig. 7, so that after the first preform connecting rod 30 to which the prefabricated optical fiber preform 10 is connected is fixed to the first holder 50 and the first jacket connecting pipe 40 to which the prefabricated jacket 20 is connected is fixed to the second holder 60, it is possible to ensure that the prefabricated optical fiber preform 10 and the prefabricated jacket are coaxial.
In addition, since the first fixing member 50 fixes only one end of the prefabricated optical fiber preform 10 by the first preform connecting rod 30 and the second fixing member 60 fixes only one end of the prefabricated sleeve 20 by the first sleeve connecting pipe 40, this manner does not interfere with the insertion of the prefabricated optical fiber preform 10 into the cavity of the prefabricated sleeve 20 from the end of the prefabricated sleeve 20 away from the first sleeve connecting pipe 40, and the prefabricated optical fiber preform 10 inserted into the cavity of the prefabricated sleeve 20 is ensured to be coaxial with the prefabricated sleeve 20 by the first fixing member 50 and the second fixing member 60.
With reference to fig. 3 and 8, step S500 further includes:
step S200, providing an initial casing with an initial size, and connecting a first casing connecting pipe and a second casing connecting pipe to opposite ends of the initial casing, respectively.
And S300, fixing the first sleeve connecting pipe and the second sleeve connecting pipe, and heating the initial sleeve to collapse the initial sleeve to a pre-processed sleeve with a second target size.
The specific process of collapsing the initial casing to the second target size of the pre-processed casing may use conventional methods such as oxyhydrogen flame torch heating, and is not described herein.
And step S400, removing the second sleeve connecting pipe in the prefabricated sleeve with the second target size.
It can be understood that, as shown in fig. 8, both ends of the initial sleeve 90 need to be fixed by the first and second sleeve connecting pipes 40 and 100 during the process of collapsing the initial sleeve 90 to the prefabricated sleeve 20 of the second target size, but the first and second sleeve connecting pipes 40 and 100 may affect the nesting of the prefabricated optical fiber preform 10 during the process of nesting the prefabricated optical fiber preform 10 into the cavity of the prefabricated sleeve 20, and therefore, in the above manner, by retaining the first sleeve connecting pipe 40 and then removing the second sleeve connecting pipe 100, it is possible to ensure that the prefabricated sleeve 20 can be fixed to the first fixing member 50 by the first sleeve connecting pipe 40, the coaxiality in the nesting process of the subsequent prefabricated optical fiber preform 10 is ensured, and it is also possible to ensure that the nesting of the prefabricated optical fiber preform 10 into the prefabricated sleeve 20 does not interfere with the second sleeve connecting pipe 100.
Further, fixing the first sleeve connecting pipe 40 and the second sleeve connecting pipe 100, thereafter:
the inner wall of the initial casing 90 is etched to remove impurities from the inner wall of the initial casing 90.
Specifically, the first and second sleeve connection pipes 40 and 100 are fixed; then, etching the inner wall of the initial casing 90 to remove impurities on the inner wall of the initial casing 90; the initial sleeve 90 is then heated, such as with an oxyhydrogen flame burner 70, to collapse the initial sleeve 90 to the second target size of the pre-finished sleeve 20.
It can be understood that the pre-processed jacket tube 20 needs to be fused with the pre-processed optical fiber preform 10, and thus the performance of the fused target optical fiber preform is affected if impurities are present on the inner wall of the pre-processed jacket tube 20.
Etching the inner wall of the initial casing 90 to remove impurities on the inner wall of the initial casing 90, which may specifically include:
the first gas is introduced into the cavity of the initial casing 90 through the first casing connecting pipe 40 or the second casing connecting pipe 100 and the gas pipe 80, and the initial casing 90 is heated at the same time, so that the first gas etches the inner wall of the initial casing 90.
In the above manner, the first gas may be SF 6 The initial sleeve 90 may be heated to a temperature of 1500 deg.C to 2000 deg.C to ensure SF 6 And fully reacts with impurities on the inner wall of the initial casing 90, so that the aim of cleaning the inner wall of the initial casing 90 is fulfilled, and the cleanliness of the initial casing 90 is ensured.
In some embodiments, the first casing connecting pipe 40 or the second casing connecting pipe 100 may be connected to the gas pipe 80 to introduce a mixed gas of a first gas and a second gas into the cavity of the initial casing 90, and heat the initial casing 90, so that the first gas etches the inner wall of the initial casing 90.
In the above manner, the first gas may be SF 6 The second gas may be O 2 The initial sleeve 90 may also be heated at 1500-2000 deg.C.
For example, the initial casing 90 may be filled with SF 50cc/min through the first casing connection pipe 40 or the second casing connection pipe 100 connected to the gas pipe 80 6 Gas and 1000cc/min O 2 Then, the initial sleeve 90 is heated at 1800 ℃ to complete the Etching of the inner wall of the initial sleeve 90 (Etching)
Understandably, O 2 Can be used as SF 6 Can further reduce SF 6 In an amount of O 2 It can also react with impurities on the inner wall of the initial casing 90 and can also eliminate some impurities.
Further, after etching the inner wall of the initial casing 90 to remove impurities from the inner wall of the initial casing 90, the method may further include:
the etched initial sleeve 90 is heated at 1800-2000 deg.c to remove the residual etching impurity on the inner wall of the initial sleeve 90.
Specifically, the initial sleeve 90 may be heated by a flame at 1800 ℃, 1900 ℃, 2300 ℃ or 2000 ℃, so as to remove the impurities remaining from the inner wall of the initial sleeve 90.
Further, before etching the inner wall of the initial casing 90 to remove impurities from the inner wall of the initial casing 90, the method may further include:
cleaning the initial casing 90;
a third gas is introduced into the cavity of the initial sleeve 90 through the first sleeve connection tube 40 or the second sleeve connection tube 100 connected to the gas tube 80, and the initial sleeve 90 is heated, for example, by using the oxyhydrogen flame burner 70, to remove water from the initial sleeve 90 and to preheat the initial sleeve 90. The preheating of the initial sleeve 90 is beneficial to the reaction between the first gas introduced into the cavity of the initial sleeve 90 and the inner wall of the initial sleeve 90 in the subsequent process, so as to remove impurities on the inner wall of the initial sleeve 90.
Wherein the third gas is used to drive the water vapor generated by heating in the initial casing 90. The third gas may be N 2 The gas may be used to heat the starter sleeve 90 at a temperature of 1500 c to 2000 c.
Of course, in some embodiments, the mixed gas of the second gas and the third gas may be introduced into the cavity of the initial casing 90 through the first casing connecting pipe 40 or the second casing connecting pipe 100 connected to the gas pipe 80, and the initial casing may be heated to remove water and preheat the initial casing. At this time, the second gas can be used as a carrier of the third gas, so that the amount of the third gas can be reduced, and the second gas can react with impurities on the inner wall of the initial sleeve 90, so that some impurities can be eliminated.
Referring to fig. 4, the removal of the second casing connecting pipe 100 from the prefabricated casing 20 of the second target size may specifically include:
and step S510, sealing the second sleeve connecting pipe.
For example, the second sleeve connecting pipe 100 may be sealed by a piston.
And step S520, keeping a preset pressure value in the cavity of the preprocessed sleeve.
For example, a gas such as N may be introduced into the pre-processing sleeve 20 through the first sleeve connecting pipe 40 connected with the gas pipe 80 2 Gas or other inert gas, working the sleeveA pressure of 330pa to 430pa is maintained within the lumen of the tube, such as at 330pa, 380pa, or 430pa.
Step S530, heating the joint of the second sleeve connecting pipe and the pre-processing sleeve, and driving the second sleeve connecting pipe to move relative to the pre-processing sleeve so as to separate the second sleeve connecting pipe from the pre-processing sleeve.
For example, referring to fig. 8, when the first sleeve connecting pipe 40 is fixed by the first fixing member 50 and the second sleeve connecting pipe 100 is fixed by the second fixing member 60, the second sleeve connecting pipe 100 is driven by the second fixing member 60 to move away from the prefabricated sleeve 20, so that the second sleeve connecting pipe 100 is separated from the prefabricated sleeve 20.
In the above manner, by heating the joint of the second sleeve connecting pipe 100 and the pre-processing sleeve 20, the second sleeve connecting pipe 100 and the pre-processing sleeve 20 can be conveniently and completely separated, and a preset pressure value is maintained in the cavity of the pre-processing sleeve 20 in the whole separation process of the second sleeve connecting pipe 100 and the pre-processing sleeve 20, so that the pre-processing sleeve 20 can be prevented from being heated and shrunk inwards when the joint of the second sleeve connecting pipe 100 and the pre-processing sleeve 20 is heated, and the subsequent pre-processing optical fiber preform 10 cannot be sleeved in the pre-processing sleeve 20 from the end where the second sleeve connecting pipe 100 is separated.
Further, with reference to fig. 5 and fig. 7, step S700 may specifically include:
step S710, the cavity of the prefabricated sleeve is in a negative pressure state.
And S720, enabling the prefabricated optical fiber rod and the prefabricated sleeve to rotate around the central shaft of the prefabricated optical fiber rod and the prefabricated sleeve respectively.
For example, referring to fig. 7, when the prefabricated optical fiber preform 10 is fixed to the first fixing member 50 by the first preform connecting rod 30 and the prefabricated sleeve 20 is fixed to the second fixing member 60 by the first sleeve connecting pipe 40, the prefabricated optical fiber preform 10 and the prefabricated sleeve 20 may be respectively driven by the first fixing member 50 and the second fixing member 60 to rotate around their central axes, so that the prefabricated optical fiber preform 10 and the prefabricated sleeve 20 can be uniformly heated.
And step 730, heating from one end of the prefabricated sleeve to the other end of the prefabricated sleeve gradually along the axial direction.
For example, referring to fig. 7, the fusion of the preprocessing sleeve 20 and the outer cladding of the preprocessed optical fiber preform 10 can be completed by installing an oxyhydrogen flame burner 70 on a moving device such as a machine tool, and the moving device drives the oxyhydrogen flame burner 70 to gradually move from one axial end of the preprocessing sleeve 20 to the other axial end of the preprocessing sleeve 20, so that the oxyhydrogen flame burner 70 slowly heats from one axial end of the preprocessing sleeve 20 to the other axial end of the preprocessing sleeve 20, thereby forming the target optical fiber preform.
The mode can ensure that the preprocessed optical fiber perform 10 and the preprocessed sleeve 20 are uniformly and fully fused, so that air bubbles do not exist between the preprocessed optical fiber perform 10 and the preprocessed sleeve 20, and the cleanliness of the target optical fiber perform is ensured.
Referring to fig. 6, the optical fiber preform manufacturing method may further include:
step S800, the first preform connecting rod connected with the target optical fiber preform and the first sleeve connecting pipe are removed.
The removing method of the first preform connecting rod and the first sleeve connecting pipe can refer to the removing method of the second sleeve connecting pipe 100, which is not described herein again.
And step S900, connecting handles at two ends of the target optical fiber preform.
It can be understood that, referring to fig. 7, since the first preform connecting rod 30 and the first sleeve connecting tube 40 need to be fixed by the first fixing member 50 and the second fixing member 60, respectively, during the process of forming the target optical fiber preform, which may cause scratches on the first preform connecting rod 30 and the first sleeve connecting tube 40 and contamination, the subsequent installation of the target optical fiber preform with an external apparatus can be facilitated by removing the first preform connecting rod 30 and the first sleeve connecting tube 40 and replacing them with new handles.
In addition, the application also provides an optical fiber prefabricated rod which is manufactured by adopting the manufacturing method.
The optical fiber preform comprises a fiber core and an outer cladding layer, and the outer cladding layer covers the outer surface of the fiber core.
It should be noted that, because the optical fiber preform adopts the optical fiber preform manufacturing method of the present application, the optical fiber preform at least has the beneficial effects brought by the optical fiber preform manufacturing method in the manufacturing process, and details are not repeated herein.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (12)
1. A method of fabricating an optical fiber preform, comprising:
providing a prefabricated optical fiber preform with a first target size, and connecting a first preform connecting rod to a first end of the prefabricated optical fiber preform;
providing a pre-processed casing of a second target size, and connecting a first casing connecting pipe to a first end of the pre-processed casing;
respectively fixing the first preform connecting rod and the first sleeve connecting pipe, enabling the preprocessed optical fiber preform to be coaxial with the preprocessed sleeve, and under the driving of the first preform connecting rod and/or the first sleeve connecting pipe, enabling one end, away from the first sleeve connecting pipe, of the preprocessed optical fiber preform to be sleeved into a cavity of the preprocessed sleeve along the axial direction; and
and heating the preprocessing sleeve pipe under the negative pressure state in the cavity of the preprocessing sleeve pipe, so that the preprocessing sleeve pipe and the outer cladding of the preprocessing optical fiber preform are fused to form a target optical fiber preform.
2. A method for fabricating an optical fiber preform according to claim 1, wherein the fixing the first preform connecting rod and the first sleeve connecting tube, respectively, and the aligning of the preform with the preform sleeve, and the axially inserting the preform into the cavity of the preform sleeve from the end of the preform sleeve away from the first sleeve connecting tube by the driving of the first preform connecting rod and/or the first sleeve connecting tube, comprises:
providing a group of first fixing pieces and second fixing pieces which are coaxial and arranged oppositely; and
the first fixing piece is used for fixing the first prefabricated rod connecting rod, the second fixing piece is used for fixing the first sleeve connecting pipe, and under the action of the first fixing piece and/or the second fixing piece, one end, far away from the first sleeve connecting pipe, of the prefabricated optical fiber prefabricated rod is sleeved into the cavity of the prefabricated sleeve.
3. The method of fabricating an optical fiber preform according to claim 1 or 2, further comprising, before the providing a prefabricated sleeve of a second target size and connecting a first sleeve connecting tube to a first end of the prefabricated sleeve:
providing an initial casing pipe with an initial size, and respectively connecting the first casing pipe connecting pipe and the second casing pipe connecting pipe to the two opposite ends of the initial casing pipe;
fixing the first sleeve connecting pipe and the second sleeve connecting pipe, and heating the initial sleeve to collapse the initial sleeve to a prefabricated sleeve of the second target size; and
removing a second casing connection tube in the second target size of pre-manufactured casing.
4. The method for fabricating an optical fiber preform according to claim 3, wherein the fixing of the first and second ferrule connecting tubes further comprises:
and etching the inner wall of the initial sleeve to remove impurities on the inner wall of the initial sleeve.
5. The method for fabricating an optical fiber preform according to claim 4, wherein the etching the inner wall of the initial sleeve to remove impurities from the inner wall of the initial sleeve comprises:
introducing a first gas into the cavity of the initial sleeve through the first sleeve connecting pipe or the second sleeve connecting pipe, and heating the initial sleeve at the same time, so that the first gas etches the inner wall of the initial sleeve; or
And introducing mixed gas of first gas and second gas into the cavity of the initial sleeve through the first sleeve connecting pipe or the second sleeve connecting pipe, and heating the initial sleeve to enable the first gas to etch the inner wall of the initial sleeve.
6. The method for fabricating an optical fiber preform according to claim 5, wherein the first gas is SF 6 The second gas is O 2 。
7. The method for fabricating an optical fiber preform according to any one of claims 4 to 6, wherein the etching of the inner wall of the initial sleeve to remove impurities from the inner wall of the initial sleeve further comprises:
and heating the etched initial sleeve at 1800-2000 ℃ to remove the impurities remained on the inner wall of the initial sleeve by etching.
8. A method for fabricating an optical fiber preform according to any one of claims 4 to 6, wherein the etching of the inner wall of the initial sleeve to remove impurities from the inner wall of the initial sleeve further comprises:
cleaning the initial casing;
introducing a third gas into the cavity of the initial sleeve through the first sleeve connecting pipe or the second sleeve connecting pipe, and heating the initial sleeve to remove water and preheat the initial sleeve; or
And introducing mixed gas of second gas and third gas into the cavity of the initial sleeve through the first sleeve connecting pipe or the second sleeve connecting pipe, and heating the initial sleeve to remove water and preheat the initial sleeve.
9. The method of fabricating an optical fiber preform according to claim 3, wherein the removing of the second ferrule connecting tube in the prefabricated ferrule of the second target size comprises:
sealing the second casing connecting tube;
keeping a preset pressure value in the cavity of the pre-processing sleeve; and
and heating the joint of the second sleeve connecting pipe and the pre-processing sleeve, and driving the second sleeve connecting pipe to move relative to the pre-processing sleeve so as to separate the second sleeve connecting pipe from the pre-processing sleeve.
10. The method for fabricating an optical fiber preform according to claim 1 or 2, wherein the preform sleeve is heated while the cavity of the preform sleeve is under a negative pressure, and the preform sleeve is fused with the outer cladding of the preform to form a target optical fiber preform, further comprising:
enabling the cavity of the preprocessing sleeve to be in a negative pressure state;
rotating the prefabricated optical fiber rod and the prefabricated sleeve around their central shafts; and
gradually heating from one end of the prefabricated sleeve to the other end of the prefabricated sleeve along the axial direction.
11. A method for fabricating an optical fiber preform according to claim 1 or 2, further comprising:
removing the first preform connecting rod and the first sleeve connecting pipe connected with the target optical fiber preform; and
and connecting handles at two ends of the target optical fiber preform.
12. An optical fiber preform, which is manufactured by the method for manufacturing an optical fiber preform according to any one of claims 1 to 11, the optical fiber preform comprising a core and an outer cladding, the outer cladding covering the outer surface of the core.
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| CN202211161281.XA CN115521057A (en) | 2022-09-22 | 2022-09-22 | Optical fiber preform and method for manufacturing the same |
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| CN202211161281.XA CN115521057A (en) | 2022-09-22 | 2022-09-22 | Optical fiber preform and method for manufacturing the same |
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| US4596589A (en) * | 1984-02-09 | 1986-06-24 | Perry Gregory A | Method for producing a single mode fiber preform |
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| CN109748492A (en) * | 2016-07-14 | 2019-05-14 | 浙江富通光纤技术有限公司 | A kind of preparation method of optical fiber jacket |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4596589A (en) * | 1984-02-09 | 1986-06-24 | Perry Gregory A | Method for producing a single mode fiber preform |
| WO2015157270A1 (en) * | 2014-04-10 | 2015-10-15 | Halliburton Energy Services, Inc. | Casing string monitoring using electro-magnetic (em) corrosion detection tool and junction effects correction |
| CN109748492A (en) * | 2016-07-14 | 2019-05-14 | 浙江富通光纤技术有限公司 | A kind of preparation method of optical fiber jacket |
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